Thermal threshold and sensitivity of the only symbiotic Mediterranean gorgonian Eunicella singularis by morphometric and genotypic analyses - Symbiose Marine Accéder directement au contenu
Article Dans Une Revue Comptes Rendus Biologies Année : 2013

Thermal threshold and sensitivity of the only symbiotic Mediterranean gorgonian Eunicella singularis by morphometric and genotypic analyses

Alexis Pey
  • Fonction : Auteur
Jerome Cataneo
  • Fonction : Auteur
Didier Forcioli
  • Fonction : Auteur
Paola Furla
  • Fonction : Auteur

Résumé

The only symbiotic Mediterranean gorgonian, Eunicella singularis, has faced several mortality events connected to abnormal high temperatures. Since thermotolerance data remain scarce, heat-induced necrosis was monitored in aquarium by morphometric analysis. Gorgonian tips were sampled at two sites: Medes (Spain) and Riou (France) Islands, and at two depths: 15 m and-35 m. Although coming from contrasting thermal regimes, seawater above 28 degrees C led to rapid and complete tissue necrosis for all four populations. However, at 27 degrees C, the time length leading to 50% tissue necrosis allowed us to classify samples within three classes of thermal sensitivity. Irrespectively of the depth, Medes specimens were either very sensitive or resistant, while Riou fragments presented a medium sensitivity. Microsatellite analysis revealed that host and symbiont were genetically differentiated between sites, but not between depths. Finally, these genetic differentiations were not directly correlated to a specific thermal sensitivity whose molecular bases remain to be discovered.
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Dates et versions

hal-01546168 , version 1 (23-06-2017)

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Alexis Pey, Jerome Cataneo, Didier Forcioli, Pierre-Laurent Merle, Paola Furla. Thermal threshold and sensitivity of the only symbiotic Mediterranean gorgonian Eunicella singularis by morphometric and genotypic analyses. Comptes Rendus Biologies, 2013, 336 (7), pp.331-341. ⟨10.1016/j.crvi.2013.06.008⟩. ⟨hal-01546168⟩
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